title: Differentiation of pathologic subtypes of papillary renal cell carcinoma on CT.
abstract: OBJECTIVE
  We reviewed the CT findings of the subtypes of papillary renal cell carcinoma (RCC), which behave differently clinicopathologically.
  
  
  CONCLUSIONS
  The CT features of the two pathologic subtypes of papillary RCC differ, probably reflecting their different pathologic features. Type 1 tumors have more distinct margins than type 2 tumors and have homogeneous density. Although type 2 tumors in the early stages show findings similar to those of type 1 tumors, they are at more advanced stages on the whole, with CT features showing indistinct margins, frequent centripetal infiltration, and tumor thrombi in all pT3b cases. Radiologists should be familiar with the CT features of papillary RCC that suggest different pathologic behaviors, such as tumor stage, tumor proliferation, and microvascular or vascular invasion.
authors.affiliation: Department of Diagnostic Radiology, Tohoku University Hospital, Tohoku University Graduate School of Medicine, 1-1 Seiryomachi, Aoba-ku, Sendai, Miyagi 980-8574, Japan. yamataka@rad.med.tohoku.ac.jp
authors.forename: Takayuki
authors.initials: T
authors.lastname: Yamada
authors.forename: Mareyuki
authors.initials: M
authors.lastname: Endo
authors.forename: Masahiro
authors.initials: M
authors.lastname: Tsuboi
authors.forename: Toshio
authors.initials: T
authors.lastname: Matsuhashi
authors.forename: Kei
authors.initials: K
authors.lastname: Takase
authors.forename: Shuichi
authors.initials: S
authors.lastname: Higano
authors.forename: Shoki
authors.initials: S
authors.lastname: Takahashi
mesh_terms: D000328:Adult; D000368:Aged; D002292:Carcinoma, Renal Cell / Q000000981:diagnostic imaging*; D003937:Diagnosis, Differential; D005260:Female; D006801:Humans; D007680:Kidney Neoplasms / Q000000981:diagnostic imaging*; D008297:Male; D008875:Middle Aged; D011859:Radiography; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity